How do you say

My family and I are planning to travel to Qinghai Lake this summer vacation.

..in Chinese?

我和家人计划暑假去青海湖旅行。

wǒ hé jiā rén jì huà shǔ jià qù qīng hǎi hú lǚ xíng 。

How do you say "Our friendship cooled after he left." in Chinese?